Lies in the ability to perform a missile strike with frightening accuracy.
Yeah, Russians might have a few more nukes, but Americans have better tech and far more carriers and subs to obliterate an adversary.
The USA is the only country that had used nukes against the population.
I believe they will use it again. If Putin decides to play Hirohito, the USA will not hesitate to drop a nuke on the RedSquare.